- The presence and
magnitude of ectopia on MR does not correlate with the presence and the
severity of signs and symptoms.

- Upto 30% of
individuals with more than 5 mm ectopia have no symptoms, whereas symptoms
could exist with minimal or no ectopia.

- Symptomatic
chiari-I patients may benefit from surgical decompression, while patients
without CSF flow abnormalities may not benefit.

- Although
quantitative assessment methods of the CSF flow at C.V.junction are reported,
non quantitative visual assessment including reduced flow in the posterior
subarachnoid space in phase contrast MR images are reliably used in various
studies to decide decompression.

- The technique
includes transverse and sagittal phase contrast MR images with ECG gating, with
plane of acquisition as dense (for transverse a plane transverse to the axis
with the spinal canal immediately below the tonsillar tips) patients neck in
neutral / flexed and extended positions.

- Some of the
abnormal findings of the C.V.junction CSF flow include moderate preponderance
of the anterior CSF flow and reduced flow in the posterior subarachnoid space
, hyperactive flow and flow jets.

- False positives
include absence of posterior flow, presence of anterior flow jets. CSF flow
more likely to be abnormal in flexion than other positions.

About Dr. Sumer Sethi

Number of Entries : 35

Unique blend of academic excellence and entrepreneurship, heading leading firms in India- Teleradiology Providers, pioneering company providing teleradiology services and DAMS (Delhi Academy of Medical Sciences) Premier test preparation institute in India for MD/MS/MCI preparation. He has also been an invited faculty member at various conferences, including Teleradiology in IRIA 2008 and 2011, Hospital Build Middle East, Congress of the Brain Tumor Radiology in Neuro-oncology Society. Dr. Sethi is Editor-in-Chief of Internet Journal of Radiology. He has a keen interest in Web 2.0 technologies and in maintaining his famous radiology blog, which has been featured in multiple international journals.